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4 years ago

Solve S=2πrh+πr2 for h

1 answer:

3 0

$S= \pi rh+ \pi r^2\ \ \ \ | subtract\ \pi r^2\\\\
s-\pi r^2= \pi rh\ \ \ \ | divide\ by\ \pi r \\\\
\frac{s-\pi r^2}{ \pi r}=h$

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How do you figure out the area of a triangle?

andrew11 [14]

General formula for area of triangle is $A=\frac{h_bb}{2}$ .

Where:

$h_b$ is height of triangle perpendicular to base side of triangle.
$b$ is the length of base side of triangle.

Multiplying $h_b$ and $b$ results in rectangle, dividing that by 2 gives you area of a triangle.

Hope this helps.

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3 years ago

Read 2 more answers

A college is selling tickets for a winter fund-raiser. One day, Krissa sold 14 adult tickets and 8 student tickets for a total o

FromTheMoon [43]

The statement which explains Krissa’s error is "She switched the prices of the tickets" ⇒ A

Step-by-step explanation:

A college is selling tickets for a winter fund-raiser

One day, Krissa sold 14 adult tickets and 8 student tickets for a total of $376
The next day, she sold 7 adult tickets and 11 student tickets for a total of $272
The price of one adult ticket is a
The price of one student ticket is s
She wrote and solved the following system of equations. 14a + 8s = 376 and 7a + 11s = 272
She found that the price of one student ticket is $20 and the price of one adult ticket is $12

We need to find which statement explains Krissa’s error

∵ The system of equations is:

14a + 8s = 376 ⇒ (1)

7a + 11s = 272 ⇒ (2)

Multiply equation (2) by -2 to eliminate x

∵ -14a - 22s = -544 ⇒ (3)

Add equations (1) and (3)

∴ -14s = -168

Divide both sides by -14

∴ s = 12

Substitute the value of s in equation (2) to find a

∵ 7a + 11(12) = 272

∴ 7a + 132 = 272

Subtract 132 from both sides

∴ 7a = 140

Divide both sides by 7

∴ a = 20

∵ a represents the price of one adult ticket

∴ The price of one adult ticket is $20

∵ s represents the price of one student ticket

∴ The price of one student ticket is $12

∵ She found that the price of one student ticket is $20 and

the price of one adult ticket is $12

- She switched the prices of the tickets

∴ Her error is, she switched the prices of the tickets

The statement which explains Krissa’s error is "She switched the prices of the tickets"

Learn more:

You can learn more about the system of equations in brainly.com/question/2115716

#LearnwithBrainly

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